Johann Aridi, famous pianist and noted lover, finds that Ninette Cavallar, daughter of his hostess, has fallen in love with him, he welcomes the chance for yet another boudoir-conquest until he discovers she is only sixteen-years-old. He suggest that she look with favor upon a younger suitor, Guilio Roberti. When he returns from his world concert-tour, he finds that Ninette still holds her love for him. Realizing that it is only fascination, he devises a plan to make her realize that Guilio is really the man for her. That night, at an orgy-party thrown by Madame Cavallar, in which her teen-age daughter is present, Johann makes some drunken advances on Ninette, knowing that Guilio is close and will come to her rescue, and Ninette will then toss her favors-invitation in the direction of the gallant Guilio. What Johaan. an expert swordsman and duelist, had not counted on was being challenged to a duel by Guilio. What's an old roué do do?